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Strain sensing Fabry-Perot interferometer and strain sensing method based on the interferometer

A strain sensing and interferometer technology, applied in the field of sensing, can solve problems such as poor stability, difficult manufacturing, and difficult design of cavity shape, and achieve the effects of easy manufacturing, improved sensitivity, and simple structure

Active Publication Date: 2019-10-11
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a strain sensing Fabry-Perot interferometer to solve the problem that the interferometer in the prior art is difficult to manufacture and has poor stability, and also provides a strain sensing device based on the interferometer. Inductive method to solve the problem that the prior art interferometer is not easy to design the cavity shape due to the double-cavity or multi-cavity series connection

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[0031] The technical solutions of the present invention will be clearly and completely described below through specific embodiments.

[0032] The invention provides a strain sensing Fabry-Perot interferometer, the specific structure is as follows figure 1 As shown, it includes a first single-mode optical fiber 1, a second single-mode optical fiber 2 and a capillary microtube 3, and the capillary microtube 3 is fused between the first single-mode optical fiber 1 and the second single-mode optical fiber 2, and the first single-mode optical fiber The model of 1 is SMF-28, the inner diameter of the capillary microtube 3 is 75 μm, and the outer diameter is 150 μm. The length of the second single-mode optical fiber 2 is 10 cm, which is mainly used to protect the first single-mode optical fiber 1 and the capillary microtube 3, which is convenient for strain sensing experiments.

[0033] The present invention also provides a strain sensing method based on the above-mentioned strain s...

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Abstract

The present invention relates to a strain sensing Fabry-Perot interferometer, comprising a first single mode fiber, a second single mode fiber and a capillary microtube, wherein the capillary microtube is fused between the first single mode fiber and the second single mode fiber. The strain sensing Fabry-Perot interferometer proposed by the invention has the advantages of simple structure, convenient manufacturing and easy design of various cavity shapes. A strain sensing method based on the strain sensing Fabry-Perot interferometer is used for achieving a vernier effect by connecting two single-cavity fiber Fabry-Perot interferometers in parallel by using a fiber coupler, so that the sensitivity of strain sensing is improved.

Description

technical field [0001] The invention relates to the field of sensing technology, in particular to a strain sensing Fabry-Perot interferometer and a strain sensing method based on the interferometer. Background technique [0002] Optical fiber sensors have the advantages of convenient application, anti-corrosion, anti-electromagnetic interference, compact structure, good stability, and high sensitivity. They have been widely used in various sensing fields, such as energy and environmental protection, industrial and mining enterprises, national defense, medical and health fields. [0003] Among many fiber optic sensors, the fiber optic Fabry-Perot interferometer sensor has developed very rapidly due to its unique advantages of simple fabrication, good stability and high sensitivity, and has been applied in the sensing fields of temperature, refractive index, pressure and magnetic field. The Fabry-Perot interferometer consists of two parallel flat glass plates or quartz plates,...

Claims

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Application Information

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IPC IPC(8): G01B11/16G01B9/02
CPCG01B9/02027G01B11/161G01B11/18
Inventor 刘博吴泳锋张丽佳南通赵立龙孙婷婷忻向军毛雅亚刘少鹏宋真真王俊锋哈特姜蕾
Owner NANJING UNIV OF INFORMATION SCI & TECH
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